LINETRAXX® GM420

The GM420 series loop monitor is designed to monitor the resistance of PE conductor connections in AC systems and in de-energised systems. The extraneous voltage Uf between the terminals E and KE must not exceed AC 12 V. The ohmic resistance of the conductor loop and the AC extraneous voltage Uf, if existing, will be indicated on the display. The currently measured value is continuously indicated on the LC display. If the measured resistance value increases above the set response value, the alarm will be activated and stored. Adjustable time delays allow installation-specific requirements to be considered.

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LINETRAXX® GM420
LINETRAXX® GM420

The GM420 series loop monitor is designed to monitor the resistance of PE conductor connections in AC systems and in de-energised systems. The extraneous voltage Uf between the terminals E and KE must not exceed AC 12 V. The ohmic resistance of the conductor loop and the AC extraneous voltage Uf, if existing, will be indicated on the display. The currently measured value is continuously indicated on the LC display. If the measured resistance value increases above the set response value, the alarm will be activated and stored. Adjustable time delays allow installation-specific requirements to be considered.

Questions? Contact us!

Features

  • Loop monitoring of the protective conductor in AC systems
  • Measuring circuit with high resistance to external voltage and display of the external voltage
  • Adjustable start-up, response and off-delay
  • Adjustable switching hysteresis
  • Digital measured value display via multi-functional LCD display
  • Preset function (automatic basic parameterization)
  • Indicator LEDs for operation, Alarm 1, Alarm 2
  • Measured value memory for trigger value
  • Permanent self-monitoring
  • Internal test/reset button
  • 2 separate alarm relays 1 changeover contact each
  • Quiescent/working current and fault memory behavior selectable
  • Password protection for device setting
  • Seal-able transparent cover
  • 2-module housing (36 mm)
  • Spring terminal (two terminals per connection)
  • RoHS compliant

Applications

  • Loop monitoring for motors
  • Loop monitoring in electrical systems for PE conductor interruption
  • Monitoring of earthing systems

LINETRAXX® GM420 Variant(s)

TypeMeasuring range
loop resistance
measuring range
interference voltage
supply voltage USArt. no. *
GM420-D-10...100 ΩAC 0...50 VDC 9.6 V...94 V /
AC 16...72 V, 15...460 Hz
B73082001
B93082001
GM420-D-20...100 ΩAC 0...50 VDC 70...300 V /
AC 70...300 V, 15...460 Hz
B73082002
B93082002

*(B7... = spring terminal / B9... = screw terminal)

Optional Accessories for LINETRAXX® GM420

TypeArt. No.
Mounting clip for screw mounting (one piece per device)B98060008
Mounting frame XM420B990994 

Downloads for LINETRAXX® GM420

NameCategorySizeLanguageTimestampD-/B-Number
GM420 Quickstarts 611.1 KB EN2023/10/0505.10.2023D00112
GM42x CE Declarations of Conformity 87.0 KB 2022/08/1212.08.2022
GM420 Manuals 2.0 MB EN2023/10/1111.10.2023D00112
GM420 Datasheets 273.6 KB EN2019/05/1313.05.2019D00112
Changed variants of relays from goldplated to silver-plated contacts Technical Information 166.3 KB EN2022/06/2727.06.2022